There something secret here that only members can see. Probably an audio player or something.
After Nagasaki, Oppenheimer went to Washington to convince Truman that a bigger bomb wasn’t the solution. He failed. The guy who ended up designing it was Edward Teller with a little help from a computer called ENIAC and a genius called von Neumann. In the meantime, Truman found out that the number of bombs in the bomb cupboard was a lot less than he thought.